Hi. This spring I am putting in an additional parking pad next to my driveway. It will be recycled concrete, which packs in hard enough to drive a semi on. I was once told that parking a car on gravel will make it rust faster. Supposedly that is from moisture coming up from the ground. Don't know if that's true or not. Anyone have any experience with the underside of their camper rusting faster because it was parked on gravel? Our camper only sees the road long after all the snow is gone, so road salt is not an issue. Thanks.